Research on temperature stress variation law and parameter optimization of large volume sidewall concrete in metro stations
Based on the construction of large volume concrete sidewall of Chebei Station of Guangzhou Metro Line 13,the development of temperature field and stress field caused by hydration heat at different ages was studied in detail through field monitoring and numerical simulation.The results show that the temperature change of the sidewall concrete structure can be divided into three stages:rapid heating,slow heating and cooling,and the highest temperature appears about 35h after concrete pouring.In the process of concrete hydration,the two-dimensional constraint stress changes into two stages:stress growth and stabilization.The maximum constraint stress in the horizontal and vertical directions is 2.66MPa and 1.69MPa respectively,showing anisotropy.Optimizing the mix ratio can significantly reduce the internal temperature in the sidewall concrete,reduce the first principal stress of the concrete structure,and reduce the possibility of dangerous cracks in the sidewall concrete.
metro stationconcrete hydration heattemperature stressfield monitoringnumerical analysis
NETL
NSTL
万方数据
